Study of (2, 0) Band of A2∏u-X2∑+ g System of N2+ by Optical Heterodyne Detected Velocity Modulation Spectroscopy

The (2, 0) band of the A2∏u-X2∑§+g system of N2+ was rotationally studied via optical heterodyne detected velocity modulation spectroscopy. Owing to the high sensitivity of the spectroscopy employed, the frequencies of 310 lines of this band were accurately determined. Moreover, those overlapped lines were also well determined via deconvolution method. A nonlinear least-squares fitting procedure using a standard Hamiltonian was applied to analyze this band. Therefore, the most accurate molecular constants were obtained.